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(ModeL) w. D. DOREMUS.

LOOK.

No. 243,870. Patented July 5,1881

' UNITED STATES PATENT Carton.

WILLARD D. DOREMUS, OF VASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO THE EAGLE LOCK COMPANY, OF TERRYVILLE, CONNECTICUT.

LOCK.

SPECIFICATION forming part of Letters Patent No. 243,870, dated July 5, 1881.

Application filed April 7,1881. (Model.)

To all whom it may concern Be it known that I, WILLARD D. DOREMUS, a citizen of the United States of America, residing at Washington, in the county of VVashington and District of Columbia, have invented certain new and useful Im provements in Locks; and I dohereby declare thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to Ic which it appertains to make and use the same,

reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

I 5 Figure l is a front view of a. drawer-lock with the capplate removed, showing the bolt in the unlocked position. Fig. 2 is a similar view, showing the bolt in the locked position. Fig. 3 is a back view of the look, showing the mode of effectingthechange. Fig. at is afront view of the lock, showing the key in position, and a part of the cap-plate broken away to show the adjusting-screw, &c. Fig. 5 is a perspective view of the cap-plate. Fig. 6 is a per- 2 5 spective view of the sliding bolt and its at tachments, and Fig. 7 is a view of the keys. Fig. Sis a vertical central sectional view of the casing or back plate, A, showing the depression 8 and shoulder z more fully.

o Thisinvention relates to locks designed more especially for drawers and boxes, as well as night-latches for doors.

The main object of my improvementis to so construct a lock that the operative parts can 3 5 be adjusted and set to suit the bridge, ward, or

tumbler recesses of a key.

It is a well-known fact that with the present locks now in general use, whenever a key be comeslost ormisplaced a new key must be filed and fitted to the lock by a locksmith, so that the parts can be rendered operative. This is very objectionable for various reasons, among which may be stated, first, the annoyance and time that is consumed in fitting and adjusting 5 the key, and, secondly, the expense.

The object of this invention is to overcome these serious difficulties by constructing a look so that the operating members may be adjusted and fitted, without removingthe casing or back plate of the lock, to a class of keys belonging to the same class of locks.

My invention consists in the novel construction of the back plate having two holes or apertures for adjustingtheinclosed machanism, in combination with the casing-plate constructed with the depressed portion and shoulder for maintaining the locking mechanism at a given height during the adjustment.

My invention further consists in the novel construction and combination of parts, as will be hereinafter fully set forth and specifically claimed.

To enable those skilled in the art to manufacture and operate my looks, I will now describe the same as applied to a drawer-lock.

The letter A represents the back plate of an ordinary drawer-lock, and A the cap or front plate. The back plate is provided with two studs, 1) b, arranged substantially as shown.

The letter B represents the movable bolt, having a slot at its lower end straddling the pin 1), which latter guides and aids in maintaining the vertical position of the bolt. This portion (lower end) of the bolt is reduced in thickness to about the thickness of one of the tumblers, and is formed with a notch, c, as seen in Fig. 6, to receive the bit of the flat key, and by which engagement the bolt is shot forward or drawn back.

The letter C represents a tumbler, formed at its upper end with a triangular-shaped notch or gate, and provided atitslower end with the usual tumbler-spring, 6. Two or more of these tumblers, arranged independently of each other, are journaled upon the pin or stud b, so as to have vibratory movements in the same direction. The upper ends of the springs of these tumblers have their bearin gs against the stud I), as shown in Figs. 1 and 2 of the drawings.

The bolt B is provided immediately under its re-enforced head with two pins, hh, arranged in the same horizontal plane, and adjusted over these pins, so as to have alimited sliding motion, are arranged the slotted bars E with 5 the pendent fingers or dogsK. These bars are preferably of a length less than the widest portion of the bolt, so that when the greatest adjustment is made the further adjusted end will not project beyond the side edge of the bolt. These slotted arms, arranged upon the bolt in a series, are of the same length, and the arrangement of the pendent fingers are substantially the same. These slotted arms are held in place to the bolt by means of a setscrew, 1, having a transverse groove at each end to receive a screw-driver. The back plate of the lock is formed with two holes, mm, the lower one being on a line with the set-screw when the bolt is thrown down in the unlocked position, and the upper opening immediately above the lower one to register with the setscrew when the bolt is thrown upwardly about one-third or one-half its locking distance.

In the manufacture of the cap-plate A, preferably made of struck-up metal, a depressed portion, 8, with a shoulder, z, is formed, substantially as seen in Fig. 5 of the drawings. The object of the depressed portion 8 with the shoulder is to act as a guard in arresting the screw whenever it is unset, and preventing the further upward movement of the bolt and obviating a lock-out.

The method of changing the operatingparts or members of the lock to a new key is as follows: The screw-driver is inserted into the lower opening, an, (see Fig. 3,) for changing the order or relative position of the tumblers. When the set-screw is loosened, by means of the screw-driver, so as to abut against the wall of the depression in the cap-plate, a springpressure is exerted upon the tumblers, which, owingto the connection, forces the slotted arms laterally. The new key is now introduced into the ordinary key-hub arranged within the casing and turning therewith, the tumblernotches are brought in contact with the loose tumbler so as to register therewith, and by turning the key the bolt is raised until the setscrew strikes the shoulder'z of the depression, as seen in Fig. 4., so as to register the set-screw with the upper opening, m, (see Fig. 3,) when the screw-driver is inserted and the screw set to its normal condition, confining the slotted bars, with their dogs, in the new order, thus changing the lock mechanism within a few minutes. Thus it will be observed that the locking mechanism is adjusted and fitted to the new key without detaching the lock or removing the back plate or casing, the advaw tagcs of which are obvious.

\Vhat I claim as myinvention, and desire to secure by Letters Patent, is

1. The combination, with lock mechanism of the class described, of the back plate, A, provided with two holes or apertures, m m, arranged in the same vertical plane, and the easing A, formed with the depressed portion 8, and the shoulder z, for the purpose hereinbefore set forth.

2. In a drawer or similar lock, the combination, with the vibrating tumblers having notches at their upper ends, and the bolt provided with the projecting fingers engaging with the slots of the vibrating tumblers, and a set-screw for adjusting the fingers within the slots of the tumblers, of the casing or back plate formed with the depressed portion .9 and shoulder z, for the purposehereinbefore stated.

In testimony whereof I affix my signature in presence of two witnesses.

\V. D. DOREMUS.

Witnesses HIRAM MIcrrAELs, HARRY DOUGLAS. 

